Design of a metal hydride-coated tilted fibre Bragg grating (TFBG) based hydrogen sensor

Kasun P. W. Dissanayake; H. Sandra Dewi; Herman Schreuders; Lars J. Bannenberg; Roger M. Groves

doi:10.1117/12.3016505

20 June 2024 Design of a metal hydride-coated tilted fibre Bragg grating (TFBG) based hydrogen sensor

Kasun P. W. Dissanayake, H. Sandra Dewi, Herman Schreuders, Lars J. Bannenberg, Roger M. Groves

Proceedings Volume 12999, Optical Sensing and Detection VIII; 1299927 (2024) https://doi.org/10.1117/12.3016505
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

The research focuses on metal hydride-coated Tilted Fiber Bragg Grating (TFBG) sensors for hydrogen detection. To overcome hysteresis issues linked to traditional sensing materials like palladium, tantalum (Ta) is introduced as an innovative alternative. The study details the establishment of optical constants for these novel materials via ellipsometry, involving the deposition of a nanometer-scale metal stack on a glass substrate. This thin film stack serves as the adhesion, sensing, and capping layer, enabling the selective absorption and desorption of hydrogen molecules, resulting in discernible changes in optical properties. The research includes comprehensive optical constant data, such as the complex refractive index, derived from ellipsometry measurements. Furthermore, the study incorporates these optical constants into a numerical model, examining mode propagation in TFBG sensors coated with Ta-based hydrogen-sensing materials. It explores mode coupling phenomena, characterizes transverse modes, and delves into key parameters, including electric field profiles, mode field diameters, and grating parameters essential for optimizing sensor performance.

Citation Download Citation

Kasun P. W. Dissanayake, H. Sandra Dewi, Herman Schreuders, Lars J. Bannenberg, and Roger M. Groves "Design of a metal hydride-coated tilted fibre Bragg grating (TFBG) based hydrogen sensor", Proc. SPIE 12999, Optical Sensing and Detection VIII, 1299927 (20 June 2024); https://doi.org/10.1117/12.3016505

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